Signal transmission for proximity-based services wireless communications

Abstract

A technique may include transmitting, by a user device in a proximity-based services wireless network via a first time-frequency resource identified by a first logical time index within N logical time resources and a first logical frequency index in the range from 0 to M−1, a first occurrence of a signal for the user device during a transmission period; determining a time index adjustment associated with the first logical frequency index; determining, by the user device, a second logical time index of a second time-frequency resource for transmitting from the user device a second occurrence of the signal within the transmission period, the second logical time index being determined based on the first logical time index and the time index adjustment associated with the first logical frequency index; and transmitting, by the user device via the second time-frequency resource, a second occurrence of the signal during the transmission period.

What is claimed is: 
     
       1. A method comprising:
 transmitting, by a user device in a proximity-based services wireless network via a first time-frequency resource identified by a first logical time index within N logical time resources and a first logical frequency index in the range from 0 to M−1, a first occurrence of a signal for the user device during a transmission period; 
 determining a time index adjustment associated with the first logical frequency index; 
 determining, by the user device, a second logical time index of a second time-frequency resource for transmitting from the user device a second occurrence of the signal within the transmission period, the second logical time index being determined based on the first logical time index and the time index adjustment associated with the first logical frequency index; 
 determining a cyclical shift amount associated with the first logical frequency index; 
 cyclically shifting the first logical time index by the cyclical shift amount assigned to the first logical frequency index to obtain the second logical time index; and 
 transmitting, by the user device via the second time-frequency resource, a second occurrence of the signal during the transmission period, 
 wherein the cyclic shift amount assigned to the first logical frequency index is equal to the first logical frequency index plus one, where M<N. 
 
     
     
       2. The method of  claim 1  wherein the signal comprises a scheduling assignment. 
     
     
       3. The method of  claim 1  wherein the signal comprises a discovery signal. 
     
     
       4. The method of  claim 1 , wherein a first set of M logical frequency resources are available for a transmission of the first occurrence of the signal, and a second set of M logical frequency resources are available for a transmission of the second occurrence of the signal, to provide a total of 2M available frequency resources, wherein the second logical frequency index is offset by M frequency resources from the first logical frequency index. 
     
     
       5. An apparatus comprising at least one processor and at least one memory including computer instructions, when executed by the at least one processor, cause the apparatus to:
 transmit, by a user device in a proximity-based services wireless network via a first time-frequency resource identified by a first logical time index within N logical time resources and a first logical frequency index in the range from 0 to M−1, a first occurrence of a signal for the user device during a transmission period; 
 determine a time index adjustment associated with the first logical frequency index; 
 determine, by the user device, a second logical time index of a second time-frequency resource for transmitting from the user device a second occurrence of the signal within the transmission period, the second logical time index being determined based on the first logical time index and the time index adjustment associated with the first logical frequency index; 
 determine a cyclical shift amount associated with the first logical frequency index; 
 cyclically shift the first logical time index by the cyclical shift amount assigned to the first logical frequency index to obtain the second logical time index; and 
 transmit, by the user device via the second time-frequency resource, a second occurrence of the signal during the transmission period, 
 wherein the cyclic shift amount assigned to the first logical frequency index is equal to the first logical frequency index plus one, where M<N. 
 
     
     
       6. The apparatus of  claim 5  wherein the signal comprises a scheduling assignment. 
     
     
       7. The apparatus of  claim 5  wherein the signal comprises a discovery signal. 
     
     
       8. The apparatus of  claim 5 , wherein a first set of M logical frequency resources are available for a transmission of the first occurrence of the signal, and a second set of M logical frequency resources are available for a transmission of the second occurrence of the signal, to provide a total of 2M available frequency resources, wherein the second logical frequency index is offset by M frequency resources from the first logical frequency index. 
     
     
       9. A method comprising:
 transmitting, by a user device in a proximity-based services wireless network via a first time-frequency resource identified by a first logical time index and a first logical frequency index in the range from, a first occurrence of a signal for the user device during a transmission period; 
 determining a cyclical shift amount associated with the first logical frequency index; 
 cyclically shifting the first logical frequency index by the cyclical shift amount assigned to the first logical frequency index to obtain the second logical time index; and 
 determining a second logical frequency index of a second time-frequency resource as the first logical frequency index plus an offset of one-half a total number of logical frequency resources; and 
 transmitting, by the user device via the second time-frequency resource and the second logical frequency resource, a second occurrence of the signal during the transmission period. 
 
     
     
       10. The method of  claim 9  wherein the transmitting comprises:
 transmitting, by a user device in a proximity-based services wireless network via a first time-frequency resource identified by a first logical time index within N logical time resources and a first logical frequency index in the range from 0 to M−1, a first occurrence of a signal for the user device during a transmission period, wherein the total number of logical frequency resources is 2M. 
 
     
     
       11. The method of  claim 9  wherein the signal comprises a scheduling assignment. 
     
     
       12. The method of  claim 9  wherein the signal comprises a discovery signal. 
     
     
       13. An apparatus comprising at least one processor and at least one memory including computer instructions, when executed by the at least one processor, cause the apparatus to:
 transmit, by a user device in a proximity-based services wireless network via a first time-frequency resource identified by a first logical time index and a first logical frequency index in the range from, a first occurrence of a signal for the user device during a transmission period; 
 determine a cyclical shift amount associated with the first logical frequency index; 
 cyclically shifting the first logical time index by the cyclical shift amount assigned to the first logical frequency index to obtain the second logical time index; and 
 determine a second logical frequency index of a second time-frequency resource as the first logical frequency index plus an offset of one-half a total number of logical frequency resources; and 
 transmit, by the user device via the second time-frequency resource and the second logical frequency resource, a second occurrence of the signal during the transmission period. 
 
     
     
       14. The apparatus of  claim 13  wherein the signal comprises a scheduling assignment. 
     
     
       15. The method of  claim 13  wherein the signal comprises a discovery signal.